I really dislike Madge and Marge as nicknames for Margaret - they are horrid and dowdy and unworthy of beautiful Margaret - Madge was an old vulgar name for a certain part of the female anatomy, certainly used up to and during the eighteenth century in Britain. Madge seems reminiscent of 1920s and 1930s boarding school jolly hockey sticks characters in books for girls. Marge reminds me of margarine.